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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Income Taxes
Income tax provisions	$ 18.0	$ 12.0	$ 58.5	$ 33.5
Effective tax rate (as a percent)	32.00%	27.40%	32.00%	26.10%	31.80%
Release of reserves for uncertain tax positions as a result of an audit settlement		$ 1.0		$ 5.5
Effective rate (as a percent)			31.00%		31.00%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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